JPH0748290B2 - Disk playback method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a reproducing method of a disk player having a plurality of disk drive mechanisms and reproducing with a single pickup over each disk. is there.

(B) Prior Art As an example of a disc player having a plurality of disc drive mechanisms and reproducing by a single pickup over each disc, for example, Japanese Patent Laid-Open No. 57-195368 (G11B21 / 04). Have been disclosed in. In such a player, the discs are mounted on the player by two disc storage units rotatably arranged on the entire surface of the player, and when the discs are mounted on the player in this manner, the discs are located on the same plane. ing. The information of the discs thus mounted is read by a single pickup that moves in the radial direction connecting the discs, and the information is reproduced. In the case of such a configuration, since two discs can be reproduced by a single pickup, one pick-up can be substantially omitted, which is advantageous in terms of cost. On the other hand, the disc to be reproduced can be reproduced from one side. When switching to the other disc, the pickup must be transferred to the other disc, which causes a problem that it takes time to switch the reproduction.

When such a device is applied to a compact disc player, the table of contents information (T, O, C: Table of Contents) of the disc must be read from the disc and stored before loading when the disc is loaded. As you can see, a single pickup spans two discs
There is a problem that it takes time to read the T, O, C information, and it is difficult to set the player in a reproducible state.

Further, in such a configuration, when the disc is stored in only one disc storage portion, the pickup is
In order to read the T, O, and C information, the information may be transferred to the empty disc storage portion side, which causes a problem that the reproduction start is delayed.

By the way, in such a disc player, a display symbol is usually added to identify each storage unit, and such a display symbol is, for example, "1", "2" or "A", "B". It is common. When the display symbol is attached to the disc storage portion in this way, the operator is convinced that the psychologically younger one (“1” or “A” in the above case) has the priority in the disc playback order. , In many cases, the disc to be played first is stored in the disc storage part with the younger symbol.

(C) Problem to be Solved by the Invention The present invention is to provide a disc reproducing method capable of executing a quick reproducing operation in a disc player reproducing a plurality of discs by a single pickup. .

(D) Means for Solving the Problems In view of the above problems, the disc reproducing method of the present invention comprises: a first mounting unit for mounting the first disc; a second mounting unit for mounting the second disc; First and second disc detecting means respectively arranged on the first and second mounting means,
A single pickup for reading information over the first and second discs, a first display means for displaying the first mounting means, and a second display means for displaying the second mounting means. A reproducing method of a disc player having, wherein the first and second display means are consecutive symbols according to a predetermined regularity, and when the first and second discs are loaded at the same time, a pick-up of the display symbol is displayed. When the presence of each disc is detected by the first and second disc detecting means positioned at the disc position on the side corresponding to the display symbol having the slower rank, the display symbol is set after the loading of each disc is completed. Among them, the disc mounted at the disc mounting position with the slowest priority is given priority and the table-of-contents information of each disc is sequentially read and memorized. When the disk is positioned at the earliest disk position of the display symbol and it is detected by the first and second disk detecting means that there is no disk, after the loading of each disk is completed, the disk is mounted at any disk mounting position. The index information of only the loaded disc is read and stored, and when the reading of the index information is completed, the pickup is positioned at the disc position where the presence of the disc is detected by the first and second disc detection means.

(E) Operation According to the first feature, the pickup reads the table of contents information after reading the table of contents information of the disc having the slower order of display symbols and then the table of contents information of the disc with the earlier order of display symbols. At the time of completion, the disc is always positioned at the disc position on the side of the higher order of the displayed symbols, so that the read operation of the table of contents information can be rapidly followed by the reproduction operation of the disc on the side of the higher order of the displayed symbols.

Further, according to the following characteristics, when a plurality of discs are loaded in the player, the table of contents information is read in order from the disc having the lowest order of display symbols to the order having the highest order of order. Upon completion of reading, the pick-up is positioned at the disc position having the highest rank of the display symbol, so that the operation of reading the table of contents information can be rapidly followed by the disc reproducing action having the highest rank of the display symbol.

Further, according to the following feature, it is detected that one of the disc mounting means does not have a disc mounted, and accordingly, the pickup is positioned at the disc position where the disc is present. It can be prevented from shifting in the disc direction.

(F) Embodiment One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a disc player.
(1) is the player body, (2) is the front panel,
(3), (4), (5) and (6) are the power switch, the operation button section, the display section and the ten-key section arranged on the front panel (2), and (7) is the same on the front panel (2). The arranged opening (8) is a tray for disc transfer which moves horizontally inside and outside the player main body (1) through the opening (7).

2 and 3 are a perspective view and a plan view showing the tray (8). As shown in the drawing, the tray (8) is formed with first disk storage portions (9) and (9) of the same diameter on the upper surface thereof.
Furthermore, on the bottom of each, there is a second disk storage part (10) of the same diameter.
(10) is formed concentrically. Of these, the first disc storage part (9) (9) has a diameter slightly larger than the 12 cm diameter compact disc, while the second disc storage part (10) (10) has a diameter larger than the 8 cm diameter compact disc. It has a large diameter with a small amount. Reference numeral (11) is an opening that allows the turntable to support the disc and the movement of the pickup when the tray is loaded, and reaches the center position of each disc storage portion. (12) (12) and (13) are concave portions and step portions for disc holding, which are formed deeper than the disc storage portions. The recesses (12) and (12) are arranged at an angle of 45 ° with respect to the center of the disk housing as shown in FIG. Further, A is printed on the left side and B is printed on the right side as identification symbols on the front surface of the tray (8). (14) (1
4) is a through hole for detecting the presence / absence of the disc, and (15) and (15) are ridges for guiding the tray.

FIGS. 4 (a), (b) and (c) are sectional views taken along the line AA 'in FIG. (16) is a fixed chassis installed in the player,
(17) is a mechanism chassis (hereinafter referred to as a mechanical chassis) movably supported in the fixed chassis (16) in the vertical direction, and (18) and (19) are turntables mounted in the mechanical chassis (17). And a pickup, (20) is a photo sensor which is also mounted on the mechanical chassis (17), (21) is a clamp lever having a U-shaped cross section whose ends are fixed to the upper part of the mechanical chassis (17), (22 ) Is a clamp member loosely fitted in a through hole (23) formed at a position of the clamp lever (21) facing the turntable (18), and (24) is fixed to the upper surface of the clamp lever (21) and clamped. A slope spring for pushing down the protrusion (22a) on the upper surface of the member (22), and a tongue piece (25) arranged on the side of the clamp lever (22) and supporting the light emitting diode (26) on the lower surface.
The photo sensor (20) and the light emitting diode (26) face each other through an opening (27) formed in the fixed chassis (16). In addition to the turntable (18), the mechanical chassis (17) is equipped with a reproducing mechanism such as a spindle motor (not shown). still,
FIG. 1 shows a sectional view taken along the line AA ′ of FIG.
The BB 'sectional view is also the same except for the arrangement of the pickup (19). Here, the pickup (19) moves between the two turntables in the direction perpendicular to the paper surface of FIG.

As for the mounting of the disc, the disc having a diameter of 12 cm (D ₁ ) or the disc having a diameter of 8 cm (D ₂ ) is placed in the first or second disc storage portion (9) (9) or (10 ) (10) and then, by operating the tray start button arranged on the front panel (2). That is, by such an operation, the tray (8) is loaded into the player while holding the disc, and eventually the tray (8) reaches the tray loading position shown in FIG.
Next, the mechanical chassis (17) is lifted by a drive device (not shown), and the disc is turned on the turntable (18).
The clamp member (22) is engaged with and placed on (18)
The disc (D ₁ ) (or the disc (D ₂ )) is pressed against the (22) and the leaf springs (24) and (24) are attached as shown in FIG.
It is clamped between the turntables (18) (18) and the clamp members (22) (22) by the urging force.

When the disc is mounted in this manner, the presence / absence of the disc is simultaneously detected at this time at the timing shown in FIG. That is, in the state shown in FIG.
The through holes (14) (14) arranged in the
Because it is between 6) (26) and the photo sensor (20) (20),
If the disc is the first or second disc storage part (9)
If not stored in (9) or (10) (10), the light emitted from the light emitting diodes (26) (26) is received by the photosensors (20) (20). On the other hand, if a disc is stored in the disc storage portion, the laser light is blocked by the disc, so the photo sensor (20)
The emitted light does not enter (20). Therefore, the presence or absence of the disk can be detected by the presence or absence of signals from the photo sensors (20) and (20) when the tray (8) shown in FIG.

FIG. 5 shows a circuit block diagram of a control circuit for controlling the drive of the tray and the pickup when the tray is driven. In such a circuit block diagram, an open switch (28) and a close switch (2) are provided on the front panel to support the opening and closing of the tray.
In response to the operation of 9), a command signal is applied to the control microcomputer (hereinafter referred to as the control microcomputer) (30),
In response to this, the loading motor (31) is rotated in a desired direction, and the tray (8) is loaded and unloaded. Further, when the open switch (28) or the close switch (29) is operated in this manner, the sled motor (32) is driven accordingly, and the pickup (19) causes the disc on the identification symbol B side (hereinafter referred to as disc B). (Referred to as)) is moved to the inner circumference. Completion of the movement of the pickup (19) is detected by the limit switch (33). The completion of movement of the pickup (19) on the side of the disk A is detected by the limit switch (34). It should be noted that the completion of loading and detection of the tray (8) is detected by a limit switch (not shown). When the loading of the tray (8) is completed, the light emitting diodes (26) and (26) are turned on, and the presence or absence of the disc is determined by whether or not the emitted light is received by the photosensors (20) and (20) facing the light emitting diodes. Is determined.

Next, the operation of the control circuit will be described in more detail with reference to the flowcharts of FIGS.

FIG. 6 is a flowchart showing the tray opening operation.
When the above-mentioned open switch (28) is operated in the tray closed state, the loading motor (31) is driven in step 1 in response to this, and the carry-out operation of the tray (8) is started. At the same time, the pickup (19) is moved in the inner peripheral direction of the disc B in step 2 at the same time. When the carry-out of the tray (8) is started in this way, next,
Step 3 by observing the state of the limit switch mentioned above
Thus, it is determined whether or not the carry-out of the tray (8) is completed. If NO is determined in such step, in the next step (step 4), the limit switch (3
3) Pick up by monitoring the status of (19)
Is moved to the innermost circumference of the disc B or not.
If YES is determined in this step 4, the movement of the pickup (19) is stopped and then the process returns to step 3, and if NO is determined, the process returns to step 3 without stopping the movement of the pickup (19).

According to the steps 3 to 5, the tray (8)
When the pickup (19) has been moved first when carrying it out,
At that time, the movement of the pickup (19) is stopped. That is, for example, when the open switch (28) is operated to eject the tray (8) when the pickup (19) is at the outermost position of the disc A (outermost position of the 12 cm diameter disc), the pickup (19) causes the disc (19) to move. Since it is close to the B disk storage portion, the movement distance of the pickup (19) is small, and therefore, the completion of the movement of the pickup is faster than the completion of the ejection of the tray (8). In this case, YES is determined in step 4, and the movement of the pickup (19) is stopped in step 5.

Next, if YES is determined in step 3, step 6
And the unloading of the tray (8) is stopped. At this time, if the movement of the pickup (19) is completed as in the case described above, the opening operation of the tray is completed through steps 7 and 8. On the other hand, if the movement of the pickup (19) is not completed at the timing when the discharge of the tray (8) is stopped in step 6, NO in step 7.
The pickup (19) continues to move.
Then, when the pickup (19) reaches the innermost position of the disc B thereafter, YES is determined in the step 7, and the movement of the pickup (19) is stopped in the step 8.

As described above, when the tray opening operation is executed normally, the pickup is positioned at the innermost position of the disc B when the opening operation is completed.

Next, the tray closing operation will be described with reference to FIG.
Incidentally, in the closing operation of such a tray, if the opening operation of the tray is completed, the pickup is positioned at the innermost peripheral position of the disc B, so that it is no longer necessary to move the pickup. When the tray is closed and the movement of the pickup is continued (when step 7 in the above flow chart) after the tray has been carried out, if an interrupt command to close the tray is issued, the tray opening operation according to the above flow chart The tray closing operation according to the flowchart shown in FIG. 7 is executed before the completion of the above. However, in this case, since the movement of the pickup is continued, the pickup closing operation is performed in the flowchart for executing the tray closing. Is provided for the movement determination routine.

When the closing switch (29) shown in the circuit block diagram of FIG. 5 is closed, the tray closing operation is executed according to the flowchart shown in FIG. That is, the loading operation of the tray (8) is started in step 1, and at the same time, the pickup (19) is moved in the innermost circumferential direction of the disc B. When the carry-in operation of the tray (8) is performed in this manner, it is then determined in step 3 whether the carry-in of the tray (8) is completed. If NO is determined in this step, it is determined whether or not the movement of the pickup (19) is completed in the next step (Step 4). If the determination result is NO, the process returns to Step 3 and YES is determined. If there is, the movement of the pickup (19) is stopped in step 5, and then the process returns to step 3. As described above, if the movement of the pickup (19) is completed according to the flow chart for opening the tray, the timing of moving the pickup (19) is determined to be YES in step 4 at the same time in step 2, Since the movement of the pickup (19) is stopped at 5, the pickup (19) hardly moves compared to the initial position. on the other hand,
If the pickup (19) is still moving as described above, it is determined in step 4 whether or not the pickup (19) has reached the innermost position of the disc B. If NO, the process returns to step 3. If YES, stop the pickup (19) in step 5, and then return to step 3.

When the loading of the tray (8) is completed, and YES is determined in step 3, the process proceeds to step 6 and the loading of the tray (8) is stopped. At this time, if the movement of the pickup (8) has not been stopped in steps 4 and 5, the movement of the pickup (8) is forcibly stopped in step 7. Thus, according to the tray closing flow chart, if the pickup moves to the innermost circumference of the disc B before the tray is loaded, the pickup waits at the innermost circumference position, but during the movement of the pickup. When the loading of the tray is completed, the movement of the pickup is stopped at that timing.

Next, the reading operation of T, O, C information will be described with reference to the flowchart of FIG.

When the tray closing operation is completed as described above, the T, O, C reading operation is started at that timing according to the flowchart of FIG. That is, the presence / absence of the disk B is determined in step 1 depending on whether or not the photo sensor (20) on the disk B side receives the light emitted from the light emitting diode (26). If YES is determined in such step, T of the disc B,
The O and C information is read and stored in the RAM in the control microcomputer (30). Among these two steps, step 2 has a step of moving the pickup (19) to the innermost peripheral portion of the disc B. The movement of the pickup is such that the pickup (19) moves during the tray loading operation. It is considered only when the movement is stopped on the way. here,
In the tray opening operation and the tray closing operation, the pickup (19) has reached a position near the innermost circumference of the disc B, so that the time required for the pickup to move is small. Thus, when the disc B is present, T, O, C can be read quickly by the pickup (19). When the reading of the T, O, C information of the disc B is completed in this way, in the next step (step 4), it is judged whether or not the disc A exists based on the signal from the photo sensor (20). . If YES is determined in this step, the pickac (19) is moved to the innermost peripheral portion of the disc A in step 5, and the T, O,
The C information is read and stored in the RAM in the control microcomputer (30).

When both the disk A and the disk B are present as described above, the pickup (19) first detects the T, O, C of the disk B.
Since the information is read, and then the T, O, C information of the disk A is read, the disk A is read at the end of reading the T, O, C information.
Since the pickup (19) is located at the inner circumference of
When the disc A is reproduced next, it is possible to quickly shift to the disc reproducing operation.

Next, the case where the disk A or the disk B does not exist will be described. First, if the disk B does not exist, this is determined in step 1, the process proceeds to step 4, and it is determined whether or not the disk A exists next. When the presence of the disc A is determined in step 4, the pickup (19) is transferred to the disc A. At this time, before the pickup (19) is transferred to the disc A,
Most of them are located at the innermost position of the disc B, so when the pickup (19) is transferred to the disc A, the transfer distance is from the innermost position of one disc to the innermost position of the other disc. It is a relatively large distance up to the position. On the other hand, in the same manner as described above, when the absence of the disc B is detected and the pickup (19) is transferred to the disc A, the pickup (19) is located closer to the disc A than the innermost position of the disc B before the transfer. It may be located in an offset position. This occurs when the tray loading is completed before the movement of the pickup (19) is completed during the tray closing operation. In such a case, since the transfer distance of the pickup (19) is smaller than that in the above case, the time required to transfer the pickup (19) is shortened.

Further, when only the disc B is stored in the tray (8), the T of the disc B, T
After the O, C information is read, the absence of the disk A is detected in step 4, and it is determined as NO in step 4, and T, O,
The C information read operation is completed. Further, if no disc is loaded in the tray (8), step 1
Then, in step 4, both are determined to be NO, and the operation of reading the T, O, C information is completed.

As described above in detail, according to the present embodiment, the pickup is positioned in the vicinity of the innermost circumference of the disc B when the tray is opened and closed.
The T, O, C information of can be read quickly, and
Since the pickup is located near the innermost circumference of the disc A when the T, O, C information has been read, the disc A can be quickly reproduced following the T, O, C information reading operation. .

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above-mentioned embodiment, the continuous reproduction over the two disks has been described, but the continuous reproduction over the three or more disks is also applicable. In this case, the pickup may be positioned at the disc (for example, disc C) having the largest identification number when the tray is opened and closed. Further, although the tray is used as the disc mounting means in the above-mentioned embodiment, the disc may be mounted on the turntable by a front opening type or an upper opening type lid. In this case, the pickup may be moved when the lid is opened and closed.

(G) Effect of the Invention As described above, according to the disc reproducing method of the present invention, the first and second display means are made continuous symbols according to a predetermined regularity, and the first and second disc mounting means simultaneously. When mounting a disc, select the pickup from the symbols
Since it is positioned on the disc loading means side with the slower rank, the pickup information is read after reading the table of contents information of the disc with the slower rank of the display symbol and then the disc with the higher rank of the display symbol. Is always positioned at the disc position on the side with the faster display symbol when the reading of the table of contents information is completed, and the playback operation of the disc with the higher order of the display symbol can be rapidly transferred following the reading operation of the table of contents information. I can.

When the presence of each disc is detected by the first and second disc detecting means, after loading of each disc, the disc mounted at the disc mounting position with the slowest rank among the display symbols is given priority. The table of contents information of each disc is read and stored sequentially, and when the reading of the table of contents information is completed, the pickup is positioned at the disc position with the earliest display symbol order. The table of contents information is read in order,
Further, when the reading of the table of contents information is completed, the pickup is positioned at the disc position having the highest rank of the displayed symbols, and the read operation of the table of contents information can be rapidly followed by the disc reproducing operation having the highest rank of the displayed symbols.

Further, when it is detected by the first and second disc detection means that there is no disc, after the loading of each disc is completed, the table of contents information of only the disc mounted at any disc mounting position is read. Since the pickup is positioned at the disc position where the presence of the disc is detected by the first and second disc detecting means when the reading of the table of contents information is completed, the pickup is useless in the disc direction without the disc. It is possible to prevent the transfer of the player to the player, and thus to improve the operational feeling of the player.

[Brief description of drawings]

Each of the drawings shows one embodiment of the present invention. FIG. 1 is an external perspective view of a player, FIGS. 2 and 3 are perspective views and plan views of a tray, and FIGS. 4 (a) and 4 (b). (C) is A of FIG.
-A 'sectional view, FIG. 5 is a block diagram of the control circuit, FIG.
FIG. 7, FIG. 7 and FIG. 8 are flowcharts showing the tray opening operation, the tray closing operation, and the T, O, C reading operation. (19) …… Pickup, (20) and (26) …… Photo sensor and light emitting diode (disk detection means), (3
0) …… Control microcomputer.

Claims (1)

[Claims] 1. A first mounting means for mounting a first disk, a second mounting means for mounting a second disk, and first and second mounting means respectively arranged on the first and second mounting means. Second disc detecting means, a single pickup for reading information across the first and second discs, a first displaying means for displaying the first mounting means, and a second mounting means A reproducing method of a disc player having a second display means, wherein the first and second display means are consecutive symbols according to a predetermined regularity, and the first and second discs are simultaneously loaded. At this time, when the pickup is positioned at the disc position on the side corresponding to the display symbol with the slower rank among the above-mentioned display symbols, and the presence of each disc is detected by the first and second disc detecting means, each disc is detected. Rohde After the end of the reading, among the above-mentioned display symbols, the disc mounted at the disc mounting position with the slower priority is given priority and the table-of-contents information of each disc is sequentially read and stored. When the disc is positioned at the earliest rank, and it is detected by the first and second disc detection means that there is no disc, the disc is loaded at any disc mounting position after the loading of each disc is completed. A disc reproducing method characterized in that the index information of only the disc is read and stored, and when the reading of the index information is completed, the pickup is positioned at the disc position where presence of the disc is detected by the first and second disc detecting means.